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A device and method for generating a broadband noise source based on a quantum dot microcolumn laser

A broadband noise and laser technology, used in lasers, phonon exciters, laser components, etc., to achieve high-bandwidth effects

Active Publication Date: 2021-09-03
TAIYUAN UNIV OF TECH
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Problems solved by technology

However, due to the introduction of external optical feedback disturbance, such a chaotic light field will have a strong external cavity delay period, which will have a great impact on security in the field of quantum secure communication, such as quantum key distribution, chaotic synchronization, etc. Many researchers are based on suppressing the external cavity delay period of chaotic signals to improve security

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  • A device and method for generating a broadband noise source based on a quantum dot microcolumn laser
  • A device and method for generating a broadband noise source based on a quantum dot microcolumn laser
  • A device and method for generating a broadband noise source based on a quantum dot microcolumn laser

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Embodiment

[0088] A method of injecting a narrowband noise signal into a quantum dot laser to generate a broadband noise signal according to the present invention mainly includes the following steps:

[0089] (1) Fabrication of quantum dot microcolumn laser: firstly, a thick gallium arsenide cavity layer is formed by using Bragg reflectors distributed up and down, in which the upper Bragg reflector is made of AlAs / As The lower Bragg reflector is composed of aluminum arsenide / gallium arsenide mirror pairs with a logarithm between 20 and 40. A layer of quantum dots with an area density of ten to the ninth power per square centimeter is doped in the center of the cavity layer as a gain medium. Columnar structures with diameters between 7-15 μm were prepared by high-resolution electron beam lithography and plasma etching. The prepared micro-column samples are placed in a cryostat with a continuous flow temperature setting between T=22.00-30K and a temperature control accuracy of 0.01K. The ...

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Abstract

The present invention is a device based on a method for generating a broadband noise source based on a quantum dot microcolumn laser, which belongs to the technical field of broadband noise source generation methods; the technical problem to be solved is: to provide a device for generating a broadband noise source based on a quantum dot microcolumn laser Improvement of the method; the technical solution adopted to solve the above technical problems is: prepare a quantum dot microcolumn laser as the first light source; inject the external narrowband optical noise into the prepared quantum dot laser in step 1 to generate a broadband noise signal, and the quantum dot laser After the output optical signal is split by the beam splitter, one optical signal is converted into an electrical signal by the photodetector and then output to the oscilloscope and spectrum analyzer for macroscopic observation, and the other is output to Hanbury-Brown and Tevez interferometry The device performs statistical measurement of microphotons; the invention is applied to signal generation, and the broadband noise signal generated by the invention has the characteristics of high bandwidth and no external cavity period, which improves the security of communication.

Description

technical field [0001] The invention discloses a device and method for generating a broadband noise source based on a quantum dot microcolumn laser, and belongs to the technical field of generating a broadband noise source based on a quantum dot microcolumn laser. Background technique [0002] Random phenomena such as photon noise, thermal noise in resistors, and frequency jitter in oscillators have been used as physical entropy sources for non-deterministic random number generation. With the advancement of technology, the chaotic signal generated by applying external light feedback and external light injection to semiconductor lasers can also be used as an entropy source of unpredictable random numbers. Due to the high bandwidth and noise-like characteristics of the chaotic signal, the generated random bit rate is significantly improved. However, due to the introduction of external optical feedback disturbance, such a chaotic light field will have a strong external cavity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/00H04B10/70
CPCH01S5/005H04B10/70
Inventor 郭龑强郭功名
Owner TAIYUAN UNIV OF TECH
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